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此造型机利用压缩空气冲击和补充压实紧实型砂。它主要由壳体4、压板6和一个阀组成。壳体4位于砂箱1及辅助框2的上方,并与其构成一个密闭的造型腔。造型腔可与压缩空气源3接通。在壳体4里有一个可从上向下压实型砂5的压板6和一个可向压板下方的造型腔7通压缩空气的阀。为了能够通过压缩空气的快速冲击使型砂达到预紧实,设计了一个压板6的边缘和壳体4中的阀座8共同起作用的阀。最好是象图中所示的那样,将储气室9直接设置在压板6的上方。为了能够使压板保持关闭及快速打开,设计了一个能产生闭锁力的活塞12。此活塞下端面的面积比压板上压缩
This molding machine uses compressed air to impact and replenish compacted sand. It is mainly composed of the housing 4, the pressure plate 6 and a valve. The housing 4 is located above the flask 1 and the auxiliary frame 2 and constitutes a closed molding cavity therewith. The molding chamber can be connected to the compressed air source 3. In the housing 4 there is a pressure plate 6 which can compact the molding sand 5 from the top to the bottom and a valve which can compress the pressure to the molding chamber 7 below the pressure plate. In order to be able to preform the molding sand by the rapid impact of the compressed air, a valve is designed which co-operates with the edge of the pressure plate 6 and the valve seat 8 in the housing 4. Preferably, the gas storage chamber 9 is disposed directly above the pressure plate 6 as shown in the drawing. In order to be able to keep the pressure plate closed and quickly opened, a piston 12 capable of generating a locking force is designed. The lower end of the piston has a smaller area than the platen